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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523fbe54977397feae5944f0bdf079578fa3c7bde55781b449d72faa1574bff4' 
  AND token = 'vYipr3SHHvnEIQ7djv6HGqcXxw6pRflui72gmuM12P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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