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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fabd05591fc9cc752869dbd1ae909cf5658fda81b84f160189e5cabc31a529a' 
  AND token = 'tEzMdMRv4w266KEvI/1dn2OSymbKgGYA9C/xWvFOO1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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