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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4c1b354cc8b94e5a5856b455c426297ca6c6b51c57a1903fa0c8b3f67339e9' 
  AND token = 'KKvatN52kRMHF5fssql4hvwsHc/b5f+OvR+eohVti2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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