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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e98dc3ab95af9668509bd720dbea787464528c84cb05322c2944c5084728a3' 
  AND token = 'E3h9s1MPp0s8b44+oHXGcOMCaQaaSyG7RHVIt8NqmpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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