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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a030dae84926c1ee4cc9d5cc671fa4acc73408cd1db8af0d3b3558a97c873b7' 
  AND token = 'ES8uj8k6Sb3nVSqxBNDCq5JoYYAL45xBIEPsGcCxiSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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