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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8336782e2cc27547b817819bf9f357d3ccdcbdf06065681d68face6b6ff333d1' 
  AND token = 'INiZ0Hnp35B5w4pw8roIL9tg56QpA/nFu+35Pf86dCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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