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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8f080272c17aa096bf14c57dc3463614efbbba28ce2282f0d43275237cfc39' 
  AND token = 'YlkX1PzgsHMBUNPlSDvuSW8vB0SCIdkhUm2YYsgeqWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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