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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e623542cd35d684adb97b5f181fa3d3c9c3a436c9b6f3512954352174248f8' 
  AND token = 'X5w7mdXyN8RkpTCZGAklS49L2K63a7J6MBx65iPKSSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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