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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78fd133d2ea9e268005281edb2a01da1febb3ed311fe1c81a6cc86cec1905e5' 
  AND token = 'F4xx1C6TQ+u/uERwcm1tyNcSeuM3iHxbZTtliEf8UZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

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