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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbc0cfbdb0a9d61a6e5f3ddfbb2b49a1d1b1c5bea0f1f7a0611b9a4167bc0d7' 
  AND token = 'LdSBMaSKm8d3dLRSi5sxn5EFCMNKzcRAKazsZeNp70o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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