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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4a5044acf15f2765b95f64f19e0c8aa3fd006f14ddaee6cf72d6a810d7d8cc' 
  AND token = 'xd28KSPB9CUsL9JqMpxMIRo6rz6fzZwVCm0mKV1cdIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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