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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7fa7013876b7f4871a1548693310effb4eec9dca4d91e55c8d3173ebae713e' 
  AND token = 'RDs8V5OBPgCVv1vO/Gz2ccAHVMteNLwaKKsif+1esFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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