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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae599df20e79822340f79272575faeca155d94a1b2b31b2dadd67e546ae4c43d' 
  AND token = 'uHVRi3DC5RuWS5cW+vRkuyN2cO+tgVaOpuLQu2q8k0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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