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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895ba3cc83fb9c2a7f038b8f33cabe9284cd910a295b06ed5ddbcc3b0b5f138b' 
  AND token = 'H3NQ6RjKAZUI0J+gi5Sn0aNj7ZmLpeBULcLdwkdPTlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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