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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aba95993fd941de53d7db3337ff6ff5e82d6524b44aac38838e17274c329f33' 
  AND token = 'Pel7A+nJG6FeSw81Jql43XniSK5q4JpcVGU1Mm+6LK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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