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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3662e099eef524c1e9a158e0e7ff749b449bf3a4be43129ac11703d21b7864d4' 
  AND token = '3Wm84jfLE3lcfXcBOqIQViz5M32mZtLD48K59x9/Lis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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