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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3694b2284ce7696bb3f7c311787ea687ea611709423e5d3ae82ffb48794b1d80' 
  AND token = 'uJv2hDaye2OexTH5WdZhbgdkBRfkjPh8j1ORBURlnCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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