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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f307311f937d1df3b6b8a8a39ed12aa16578c1c3a8fbff5c3d3352224a7b2d' 
  AND token = 'fw6gF9nXO9zd3vDcmdQG9UHgIhyFD0SX8INrAHxGKIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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