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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3051c2888526dd254056609a24711a38598ed51ad69b21df06fcedbabd60fc0e' 
  AND token = '+f6CS0S0ourZfpFlnMikBId9F1CnSAZuAD0mDo3q79A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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