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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba297cc66fe6ad75b8a0232df9a68d0b7b28c799ee473a0aefa7bc54604cba5e' 
  AND token = 'dq9da/XrfrgGEPuf0oMGzRPcBu67mjPeDNulfPanlds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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