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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f563bea52cb3cda6acc8ea659a967109de8668b7187ecbfc2b7e4dcf4e98a9e' 
  AND token = 'aAkgrs9LUR39vjDy2w6ZOtr4MifxGb+CuT31sT5RQgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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