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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffd713f985a8370f6d2c575515b1faba977507ae46d9a46f2961c18e21cd771' 
  AND token = 'kZOcDH5R/ZyjYamdpTsgh6Qr3I0fHvriVJXTdX5cVWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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