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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17388ee465364bd27be892bb90350e4b0fadff7d06322dbee97af5c3dd52d83' 
  AND token = '6m9mPV4ebx0jK/YrO6LM6oJel4eBjUPEgAYCkzTCJwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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