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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cb85776b6b99ea3680f30db2792a5fe4a45c3fcdd7e429768d277626f67939' 
  AND token = 'F6K5jR24A6RghkLCgV495bLMqkqrQ9Ad3XkAbcwW1cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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