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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31fccf180980144d9c5277ffdf11e7bcb73e5d4caa91b2f9ff527d3b3910ceea' 
  AND token = 'THYGslNGRHjznHFeCPErm0IsZrEfHYIMz2L9h5LCUKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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