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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e30af70f79cf06dc2030f401ca6d2e96e6903c4518bbff91326c42af4f285e9' 
  AND token = 'RtXAM+4Mc4KQN0cJ1s7stPPaZGbylmaSxKx2FqNHoEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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