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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabd978e20b5840c6ad5ea00899623c3cb3bab85dad3a1a69c40b039f37a299d' 
  AND token = 'AWrXB5jOALuafdpB7EnwRTjD3psRl0wTHjaYJSAi+oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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