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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e18fcca33ac00f79a10c30a2e8ebe33b74b5105a590637e8d128c489c1c6d4d' 
  AND token = 'j0BwXWaEdT+5zuveZscDG0PAhjZr0pfGEDoIKvDljD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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