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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f337485898ba07749814594af7a740e4f49dc188aec71d159f886bb423b7757' 
  AND token = 'frDeMk0+0Hf+ORmb+wN567aRXCheOfbXBrdfVV+UeSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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