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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1148bd76bcba3e7799117be92e5823423b2a0f5d2785d7e04bf05764b3f4a432' 
  AND token = '7cysECrvF3768WtifXZ/klKE2a9X0zYsiqXJ9xxWqXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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