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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf78d59857e6e31bc7f354d05d573a069a21b5b58a5b317923acf648f8895bd' 
  AND token = '2eDrg1qgsRRncZsxryKHSOEtKUk9AFKwraAScmeIAkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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