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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f2b3e7d75c5d23697b7bcdb334b4185793dd4fa46fc07b233591de4cc9fef0' 
  AND token = 'jbjTaCiIGGwXiLc381Wcmrh5LSd+4oSgl1xREc/up/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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