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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe413580f3f9cdd9eb7e12bc501f75a7b0bc9b804d9535101d511486cf4dc4a6' 
  AND token = 'gtqg5b4sNuY6bruRiV8Wz5PjNFDz51CYXTDHCYi+4aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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