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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83dca05403590fca7faefc6b55983aa2e3843dba380a1680b6d0ed42fd5476d' 
  AND token = 'o+VqO0hcF/fwmJM0Twzot3vlZr93tsMP8y2uXEXhjFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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