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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa13f3e702a6673d6ccf54066a9a9cb6906785bc3a92e16f7557412e64c65c83' 
  AND token = '1wSyYY2NiyS5JVmvxNyacnAc9kaS75+wS6E7epyo8uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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