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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a28fc96f89a91e3547a358633cdaba8d59ff8bc3541ac9f002fff476ae7c5d6' 
  AND token = 'XOmrkIqpueLg0IT3tYJ0Ry7B45TpyVNoz1ayOO64UQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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