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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89549a6a6975da9fb0f4f38db45ed2136d96967a19007e7f4baa4dcc909cff30' 
  AND token = 'WYnWZaL3lj8wB01yKqV71Ppm2iPIHk0Ez4+XhArf4fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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