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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf614edc163459fe4032abd38c15f9d64d0fc986355d3106baf4ee1f80ae19e6' 
  AND token = 'baDn2LnuUBV2emCHCPXrb134z55vx+1vFgCz62+kQkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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