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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ab900cd920ec4371889e2905e7524e63295e95026c9c59dc4bf7e335fe7d0e' 
  AND token = '/MrlPGe7CaUTtem4Ao9hccZH3W6C/BYTjDse6deE2Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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