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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bda46e6e3db4e38136b364facc4fcb91d73345b5fba8bbea7ab58f0f466c006' 
  AND token = 'p3DMK/uy1dnqVY4a6OTpgd0KHhLvMuXVLYxMFenDsD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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