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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f8c54afb7e08a96f2503540e3d7d509a4a67ad6ab699d17ad75b540cbf2656' 
  AND token = '08yuDq9/VADbU6JCwabSqd1Sy/uaLVa0JgdlJN+4N1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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