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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb72fdf8d316d02291268e185817112a869b3c5efd9f8755df2b85c4b58438d2' 
  AND token = 'Gri4WEcGYHYJCxnvxR6ElIXbC6RDaqtkYOwpZVvDknI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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