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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bddd505c874f6bc0bce176c56c0d135cf22a7be89b6e4ce81683300f7c6fd5' 
  AND token = 'URPPk7xjASeMFTtH3yDGLJG357/sefFdQPBGzXObHNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}