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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15d3cde26fbfcfcb9d7bcbcba03d44ac55e2e7416b1fbf4071bcebe2a121c7c' 
  AND token = 'jP5YN2h07zdDzDDaag6iYuJG6undJOOo43UBkqmEKlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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