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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12e5a88ff5b6be12726ef7d0c041d433e83bdb968da2bfc30bb5e40d0d4d47e' 
  AND token = '3pYzOPwlTNm89KoJT6rMaMolih3vFGk++2aV1nNuFek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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