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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c053d3bff6ea8f0360b595a3faa7d8dca983ad5563ef927be6ecb6c128ed8e8' 
  AND token = '0db90BGT3c+TTprvp/Dqe4ja8CR9Ba8lZz0w8tR0mDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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