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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445e10f4341a4451e4a5f756c7eae605425fa0a1f908c60d3fca3b2c488857d2' 
  AND token = 'P3GpOcXca6IwKIhOfPuYDvVsZoyZuNycnN2/z8TS5Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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