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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba708772973ed53f0c6ae34690a92c02070d9eada85e068f1ed19b20f4583f4' 
  AND token = 't2oWRNMm2zqvEDHtVPVVgZuREQ1zvgSkWqhjrSeTgrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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