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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc4a0d40cad796c93ec82ce90136c836b2b0465aa528dc659cb5568b1aa6f1f' 
  AND token = 'OXvbn8eK5d+qt02bA2/o+72SXgcAP6wkzODSm2hU+64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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