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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b4e2f9712608abfb06b5b5d60ba8ab90e0649cf691df4f3204e3f27f2b4555' 
  AND token = 'cyFDr16zKb23mpIkOVT8sKq6Akc/dhpjd9DRM4lteIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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