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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d06154565b5151ec30d41d1da3081699cdf8c41e9e2a12706c1b5d52addc9e6' 
  AND token = 'GSt0ApKmIIuRWW7YlrE1NjjaWTEXIurDac1kiNliDCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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