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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffc84106640692204e0f8c66c4d5f2ac2cb364c366a892cdf38119f0cb66230' 
  AND token = 'NSL8mj69znlcB+UlUJ9gGzv0zQclHe50JPP5+FhNJNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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