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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dca540fa6ff04f0a35d6c70500d1777777c52141b4dcd8dfa437868af7b9d66' 
  AND token = 'JSkoja40gl9VdbhxWk/2ZMul+RPyyWokOzP9qBrhbE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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