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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf65470eacc24217dc3a6a0eb68f565714fe275a064855ed4367c405243d0b8' 
  AND token = 'o97EjCEI17FlBSzdxz6xkq3+SABziw7/hHr+5HCcGbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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