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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abe6cedf84cd7fda91106cdfd872aa5f553bfcf9bf35d3469f372ec0f643d60' 
  AND token = 'FG3k24cKGBM393xGLfBraZd1/5jghE9cs6o/HKqu+ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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