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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166b4b9fc184dc8f4ebc0c5ee5c43ff039d73fb3c1381abab0e87240f9546adb' 
  AND token = 'yRCQZu2IhmqN64G/LncT/DI0y1ti+8t/Yeuby6mkNSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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